Selectively providing enhanced clarification prompts in automated assistant interactions

ABSTRACT

Implementations described herein receive audio data that captures a spoken utterance, generate, based on processing the audio data, a recognition that corresponds to the spoken utterance, and determine, based on processing the recognition, that the spoken utterance is ambiguous (i.e., is interpretable as requesting performance of a first particular action exclusively and is also interpretable a second particular action exclusively). In response to determining that the spoken utterance is ambiguous, implementations determine to provide an enhanced clarification prompt that renders output that is in addition to natural language. The enhanced clarification prompt solicits further user interface input for disambiguating between the first particular action and the second particular action. Determining to provide the enhanced clarification prompt includes a current or prior determination to provide the enhanced clarification prompt instead of a natural language (NL) only clarification prompt that is restricted to rendering natural language.

BACKGROUND

Humans may engage in human-to-computer dialogs with interactive softwareapplications referred to herein as “automated assistants” (also referredto as “chatbots,” “interactive personal assistants,” “intelligentpersonal assistants,” “personal voice assistants,” “conversationalagents,” etc.). For example, humans (which when they interact withautomated assistants may be referred to as “users”) may provide commandsand/or requests to an automated assistant using spoken natural languageinput (i.e., spoken utterances), which may in some cases be convertedinto text and then processed, and/or by providing textual (e.g., typed)natural language input. An automated assistant generally responds to acommand or request by providing responsive user interface output (e.g.,audible and/or visual user interface output), controlling smartdevice(s), and/or performing other action(s).

Typically, automated assistants are configured to perform a variety ofactions, e.g., in response to a variety of command and request grammarsto which the actions are mapped. These actions can include things likeordering items (e.g., food, products, services, etc.), playing media(e.g., music, videos), modifying a shopping list, performing homecontrol (e.g., control a thermostat, control one or more lights, etc.),answering questions, booking tickets, and so forth. While naturallanguage analysis and semantic processing enable users to use slightvariations in their commands, these variations may only stray so farbefore natural language analysis and/or other semantic processing areunable to determine which action to perform. Likewise, natural languageanalysis and semantic processing may be unable to determine whichcontent should be provided in response to a user request. Consequently,if a user issues an ambiguous command or request that can be potentiallyresponded to in multiple ways, the personal assistant module may need tosolicit additional information from the user to determine how toproceed.

SUMMARY

Implementations described herein relate to selectively (i.e., only whencertain condition(s) are satisfied) causing rendering of an enhancedclarification prompt, rather than merely rendering a naturallanguage-only (“NL only”) clarification prompt. The rendering of theenhanced clarification prompt can be in response to determining that aspoken utterance of a user requests performance of one responsive actionfor which an automated assistant system has identified two or morecandidate responsive actions.

An NL only clarification prompt is an audible and/or textual prompt thatincludes only natural language and that prompts the user to selectbetween two or more candidate responsive actions or to otherwise providemore details about their request that may assist the system in selectingbetween the candidate responsive actions. The natural language, of theNL only clarification prompt, can include a characterization of thecandidate responsive actions and/or their expected results, in order toassist the user in differentiating between the options. An enhancedclarification prompt includes output that is in addition to or in lieuof natural language, and can prompt the user to select between thecandidate responsive actions or to otherwise provide more details abouttheir request that may assist the system in selecting between thecandidate responsive actions. The output that is in addition to or inlieu of natural language can include audio and/or visual content, suchas musical snippet(s), image(s), and/or video(s) that can enableefficient differentiation between the candidate responsive actions.

As one example, assume a user utterance of “Play Hypothetical Song”, andassume that “Hypothetical Song” is the name of a first song by “FirstHypothetical Artist” and is also the name of a distinct second song by“Second Hypothetical Artist”. The utterance can be captured in audiodata and processed, using automatic speech recognition, to generate arecognition of the utterance. Further, the recognition can be processed,using natural language understanding, to determine that the spokenutterance is ambiguous in that it is interpretable as requestingrendering of the first song exclusively and is also interpretable asrequesting rendering of the second song exclusively. In response todetermining the spoken utterance is ambiguous, an enhanced clarificationprompt can be rendered such as an enhanced clarification prompt thatincludes a first snippet of the first song and/or a second snippet ofthe second song and/or that includes a first image of “FirstHypothetical Artist” and/or a second image of “Second HypotheticalArtist”. For example, the enhanced clarification prompt can be “Do youwant [rendering of first snippet] or [rendering of second snippet]”.Continuing with the example, further user input can be receivedresponsive to the rendering of the enhanced clarification prompt, andprocessed to determine whether to render the first song exclusively orto instead render the second song exclusively. For example, the furtheruser input can be further spoken input and it can be compared to one ormore first properties of the first action and/or one or more secondproperties of the second action in determining which it references. Forinstance, if the further user input is “the second one”, the secondaction (rendering the second song) can be selected and implemented since“second” references the rendering order, in the enhanced clarificationprompt, for the second snippet that corresponds to the second action. Asanother example, if the further user input is “the more upbeat one”, thefirst action (rendering the first song) can be selected and implementedbased on metadata associated with the first song indicating it is highertempo than is the second song (as indicated by separate metadataassociated with the second song). As yet another example, if the furtheruser input is “the one with the acoustic guitar”, the second action(rendering the second song) can be selected and implemented based onmetadata associated with the second song indicating it includes anacoustic guitar and/or based on metadata associated with the first songindicating it does not include an acoustic guitar.

In many implementations, determining to provide the enhancedclarification prompt in response to the utterance is based on a current(i.e., in response to receiving the utterance) or prior (i.e., beforereceiving the utterance) determination to provide the enhancedclarification prompt in lieu of a NL only clarification prompt that isrestricted to rendering natural language. The determination can be madebased on determining one or more conditions are satisfied. Generally,the condition(s) can objectively indicate that provision of the NL onlyclarification prompt: is likely to result in prolonging of theinteraction between the user and the automated assistant indisambiguating the user utterance (e.g., is likely to result in afurther ambiguous input and/or a request for clarification of the NLonly clarification prompt); is likely to lead to errant user input(e.g., due to a misunderstanding of the NL only clarification prompt andresulting in an incorrect disambiguation) that can cause errantperformance of one or more automated assistant action(s) (e.g., errantand computationally wasteful rendering of the wrong song, errant andcomputationally wasteful purchasing of the wrong content, etc.); and/oris likely to lead to the user abandoning their intended goal (e.g., theuser not responding at all due to not fully understanding the NL onlyclarification prompt). Accordingly, by considering the condition(s),enhanced clarification prompt(s) can be only selectively provided inthose situations where doing so is likely to result in a shorterduration of interaction between a user and the automated assistantand/or is likely to lead to the user to provide correct disambiguatinginput, is likely to result in the user not abandoning their intendedgoal, and/or is likely to achieve additional and/or alternativetechnical benefit(s).

As one example, the determination to provide the enhanced clarificationprompt in lieu of an NL only clarification prompt can be a priordetermination made based on analysis of historical automated assistantinteraction data. For example, if historical automated assistantinteraction data indicates that the NL only clarification prompt (and/oror a group of similar NL only clarification prompt(s)) results in athreshold quantity of failures and/or results in failure with at least athreshold frequency, then it can be determined to provide the enhancedclarification prompt in lieu of the NL only clarification prompt. As aparticular example, assume the NL only clarification prompt is “Do youwant to hear the one by First Hypothetical Artist or the one by SecondHypothetical Artist?”. The enhanced clarification can be chosen over theNL only prompt if historical automated assistant interaction datareflects a large quantity of occurrences of corresponding users notresponding to instances of the NL only clarification prompt, respondingwith non-clarifying user input (e.g., “I don't know”, “which is which”,“huh”, etc.), and/or choosing the incorrect one (e.g., as reflected by aquick cancelling of the rendering of the selected song, and optionally asubsequent request to play the non-selected song).

As another example, the determination to provide the enhancedclarification prompt in lieu of an NL only clarification prompt can be acurrent or a prior determination that is made based on comparing firstterm(s) that are descriptive of the first action to second term(s) thatare descriptive of the second action. For example, if the comparisonreflects at least a threshold degree of textual and/or semanticsimilarity between first term(s) and second term(s), it can bedetermined to provide the enhanced clarification prompt in lieu of theNL only clarification prompt. As one particular example, if the NL onlyclarification prompt is “do you want news about the actor John Doe orthe producer John Doe”, it can be determined that “actor” and “producer”satisfy a semantic similarity threshold. For instance, embeddings can begenerated for “actor” and “producer” using a trained encoder (e.g., atrained neural network model), a distance between the “actor” embeddingand the “producer” embedding determined, and the distance determined tosatisfy the semantic similarity threshold. As a result, it can bedetermined to provide an enhanced clarification prompt instead, such asone that includes a first image of the actor and a second image of theproducer.

As yet another example, the determination to provide the enhancedclarification prompt in lieu of an NL only clarification prompt can be acurrent or a prior determination that is made based on inverse documentfrequency (IDF) and/or other metric(s) for first term(s) that aredescriptive of the first action and/or IDF and/or other metric(s) forsecond term(s) that are descriptive of the second action. For example,if the first term(s) and/or the second term(s) have a high IDF (i.e.,are rare across a corpus of documents), then it can be determined toprovide an enhanced clarification prompt instead of an NL onlyclarification prompt.

Various non-limiting examples of conditions that can be utilized indetermining to provide an enhanced clarification prompt in lieu of an NLonly clarification prompt have been described separately above. However,it is noted that a determination can be based on combinations of theabove examples. For example, the determination to provide the enhancedclarification prompt in lieu of an NL only clarification prompt can be acurrent or a prior determination that is made based on IDF of firstterm(s) that are descriptive of the first action and/or based on IDF ofsecond term(s) that are descriptive of the second action, and can alsobe based on a similarity measure that is based on a comparison of thefirst term(s) and the second term(s).

The preceding is provided only as an overview of some implementations.Those and other implementations are described in more detail herein, inthe accompanying drawings and the description below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an example computing environment in whichimplementations disclosed herein may be implemented.

FIG. 2 is a flowchart illustrating an example method of requestingclarification in response to an ambiguous user command or request, inaccordance with various implementations.

FIG. 3 is a flowchart illustrating an example method of determining toprovide an enhanced clarification prompt instead of a natural languageonly clarification prompt, in accordance with various implementations.

FIG. 4 illustrates an example architecture of a computing device.

DETAILED DESCRIPTION

Turning initially to FIG. 1 , an example environment is illustratedwhere various implementations can be performed. FIG. 1 includes anassistant device 102, which executes an instance of an automatedassistant client 104. One or more cloud-based automated assistantcomponents 110 can be implemented on one or more computing systems(collectively referred to as a “cloud” computing system) that arecommunicatively coupled to client device 102 via one or more localand/or wide area networks (e.g., the Internet) indicated generally at108.

An instance of an automated assistant client 104, by way of itsinteractions with one or more cloud-based automated assistant components110, may form what appears to be, from the user's perspective, a logicalinstance of an automated assistant 100 with which the user may engage ina human-to-computer dialog. An instance of such an automated assistant100 is depicted in FIG. 1 .

The assistant device 102 may be, for example: a desktop computingdevice, a laptop computing device, a tablet computing device, a mobilephone computing device, a computing device of a vehicle (e.g., anin-vehicle communications system, an in-vehicle entertainment system, anin-vehicle navigation system), a standalone interactive speaker, a smartappliance such as a smart television, and/or a wearable apparatus thatincludes a computing device (e.g., a watch having a computing device,glasses having a computing device, a virtual or augmented realitycomputing device). The assistant device 102 may be utilized by multipleusers within a household, a business, or other environment. Some ofthose multiple users may be registered or verified with the sharedassistant device 102 and have a corresponding user account accessiblevia the shared assistant device 102, while other user(s) may be viewedas guest users. Speaker recognition, facial recognition, and/or othertechnique(s) (e.g., pin entry) can be utilized to determine which ofmultiple user account(s) is interacting with the assistant 100 at agiven time. Additional and/or alternative assistant devices may beprovided.

In various implementations, the assistant device 102 may optionallyoperate one or more other applications that are in addition to automatedassistant client 104, such as a message exchange client (e.g., SMS, MMS,online chat), a browser, and so forth. In some of those variousimplementations, one or more of the other applications can optionallyinterface (e.g., via an application programming interface) with theautomated assistant 100, or include their own instance of an automatedassistant application (that may also interface with the cloud-basedautomated assistant component(s) 110).

Automated assistant 100 engages in human-to-computer dialog sessionswith a user via user interface input and output devices of the clientdevice 102. To preserve user privacy and/or to conserve resources, inmany situations a user must often explicitly invoke the automatedassistant 100 before the automated assistant will fully process a spokenutterance. The explicit invocation of the automated assistant 100 canoccur in response to certain user interface input received at the clientdevice 102. For example, user interface inputs that can invoke theautomated assistant 100 via the client device 102 can optionally includeactuations of a hardware and/or virtual button of the client device 102.Moreover, the automated assistant client can include one or more localengines 106, such as an invocation engine that is operable to detect thepresence of one or more spoken invocation phrases. The invocation enginecan invoke the automated assistant 100 in response to detection of oneof the spoken invocation phrases. For example, the invocation engine caninvoke the automated assistant 100 in response to detecting a spokeninvocation phrase such as “Hey Assistant,” “OK Assistant”, and/or“Assistant”. The invocation engine can continuously process (e.g., ifnot in an “inactive” mode) a stream of audio data frames that are basedon output from one or more microphones of the client device 602, tomonitor for an occurrence of a spoken invocation phrase. Whilemonitoring for the occurrence of the spoken invocation phrase, theinvocation engine discards (e.g., after temporary storage in a buffer)any audio data frames that do not include the spoken invocation phrase.However, when the invocation engine detects an occurrence of a spokeninvocation phrase in processed audio data frames, the invocation enginecan invoke the automated assistant 100. As used herein, “invoking” theautomated assistant 100 can include causing one or more previouslyinactive functions of the automated assistant 100 to be activated. Forexample, invoking the automated assistant 100 can include causing one ormore local engines 106 and/or cloud-based automated assistant components110 to further process audio data frames based on which the invocationphrase was detected, and/or one or more following audio data frames(whereas prior to invoking no further processing of audio data frameswas occurring). For instance, local and/or cloud-based components canprocess captured audio data using a two-pass ASR model in response toinvocation of the automated assistant 100.

The one or more local engine(s) 106 of automated assistant 100 areoptional, and can include, for example, the invocation engine describedabove, a local speech-to-text (“STT”) engine (that converts capturedaudio to text, and that is also referred to herein as an ASR engine), alocal text-to-speech (“TTS”) engine (that converts text to speech), alocal natural language processor (that determines semantic meaning ofaudio and/or text converted from audio), and/or other local components.Because the client device 102 is relatively constrained in terms ofcomputing resources (e.g., processor cycles, memory, battery, etc.), thelocal engines 106 may have limited functionality relative to anycounterparts that are included in cloud-based automated assistantcomponents 110.

Cloud-based automated assistant components 110 leverage the virtuallylimitless resources of the cloud to perform more robust and/or moreaccurate processing of audio data, and/or other user interface input,relative to any counterparts of the local engine(s) 106. Again, invarious implementations, the client device 102 can provide audio dataand/or other data to the cloud-based automated assistant components 110in response to the invocation engine detecting a spoken invocationphrase, or detecting some other explicit invocation of the automatedassistant 100.

The illustrated cloud-based automated assistant components 110 include acloud-based TTS module 112, a cloud-based STT module 114, a naturallanguage processor 116, a dialog manager 118, and one or more otherengine(s) 120 which may include, for example, one or more engine(s)tasked with maintaining user account data 161A_(1-N), performingsearches, and retrieving text, audio, or visual content for providing tothe user (e.g., retrieving media content over the internet). In someimplementations, one or more of the engines and/or modules of automatedassistant 100 may be omitted, combined, and/or implemented in acomponent that is separate from automated assistant 100. In someimplementations, automated assistant 100 may be implemented mostly orentirely on the assistant device 102 or in a particular ecosystem ofassistant devices. For instance, one or more functions of thecloud-based automated assistant component(s) 110 described herein may beperformed by one or more local engine(s) of one or more assistantdevices 102 connected over a network. Further, in some implementationsautomated assistant 100 can include additional and/or alternativeengines and/or modules.

Cloud-based STT module 114 can convert audio data into text, which maythen be provided to natural language processor 116. Cloud-based TTSmodule 112 can convert textual data (e.g., natural language responsesformulated by automated assistant 100) into computer-generated speechoutput. In some implementations, TTS module 112 may provide thecomputer-generated speech output to client device 102 to be outputdirectly, e.g., using one or more speakers. In other implementations,textual data (e.g., natural language responses) generated by automatedassistant 100 may be provided to one of the local engine(s) 106, whichmay then convert the textual data into computer-generated speech that isoutput locally. In some implementations, one or more of the componentsof automated assistant 100, such as natural language processor 116, TTSmodule 112, STT module 114, etc., may be implemented at least in part onassistant client devices 102 (e.g., to the exclusion of the cloud).

Natural language processor 116 of automated assistant 100 processes freeform natural language input and generates, based on the natural languageinput, annotated output for use by one or more other components of theautomated assistant 100. For example, the natural language processor 116can process natural language free-form input that is textual input thatis a conversion, by STT module 114, of audio data provided by a user viaclient device 102. The generated annotated output may include one ormore annotations of the natural language input and optionally one ormore (e.g., all) of the terms of the natural language input. As usedherein, free-form natural language input is input that is formulated bya user and that is not constrained to a group of options presented forselection by the user. Free-form natural language input may be spoken(and captured by microphone of assistant client device 102) and/or typed(e.g., into one or more interfaces provided by one or moreapplications).

In some implementations, the natural language processor 116 isconfigured to identify and annotate various types of grammaticalinformation in natural language input. In some implementations, thenatural language processor 116 may additionally and/or alternativelyinclude an entity tagger (not depicted) configured to annotate entityreferences in one or more segments such as references to people(including, for instance, literary characters, celebrities, publicfigures, etc.), organizations, locations (real and imaginary), and soforth. In some implementations, the natural language processor 116 mayadditionally and/or alternatively include a coreference resolver (notdepicted) configured to group, or “cluster,” references to the sameentity based on one or more contextual cues. For example, thecoreference resolver may be utilized to resolve the term “there” to“Hypothetical Café” in the natural language input “I liked HypotheticalCafé last time we ate there.” In some implementations, one or morecomponents of the natural language processor 116 may rely on annotationsfrom one or more other components of the natural language processor 116.In some implementations, in processing a particular natural languageinput, one or more components of the natural language processor 116 mayuse related prior input and/or other related data outside of theparticular natural language input to determine one or more annotations.

Dialog manager 118 may be configured to map a representation of a userrequest to perform some action, e.g., using the annotations, to one ormore “responsive actions” of a plurality of candidate responsive actionsthat are then performed by automated assistant 100. In someimplementations, dialog manager 118 may have access to one or moredatabases (not depicted) that include, for instance, a plurality ofmappings between grammars and responsive actions (or more generally,intents). In many cases, these grammars may be selected and/or learnedover time, and may represent the most common intents of users. Forexample, one grammar, “play <artist>”, may be mapped to an intent thatinvokes a responsive action that causes music by the <artist> to beplayed on the assistant device 102 operated by the user. Anothergrammar, “[weather|forecast] today,” may be match-able to user queriessuch as “what's the weather today” and “what's the forecast for today?”In some implementations, these mappings may include mappings betweenentities and candidate responsive actions that are performable inassociation with those entities.

In addition to or instead of grammars, in some implementations, dialogmanager 118 may employ one or more trained machine learning models,alone or in combination with one or more grammars. These trained machinelearning models may also be stored in one or more databases and may betrained to identify intents, e.g., by embedding data indicative of auser's utterance into a latent space, and then determining which otherembeddings (and therefore, intents) are most proximate, e.g., usingtechniques such as Euclidean distance, cosine similarity, etc.

Various contextual signals may be used to perform various aspects of thenatural language processing and dialog managing features describedherein. For example, entity or entity type recognition, entity or entitytype ranking, identification of candidate responsive actions associatedwith entities or entity types, ranking of candidate responsive actions,and/or filtering of candidate responsive actions, may be performed basedon contextual signals. Contextual signals or “cues” associated with auser and/or a client device they operate may include, for instance, alocation (e.g., determined using GPS, wireless triangulation, inertialmeasurement units, etc.), time of day, user preferences, calendarentries of the user, communications to/from the user (e.g., emails,direct messages, text messages, etc.), social networking activity,current user activity (e.g., exercising, flying, driving, ridesharing,etc.), applications that are installed or otherwise accessible to theuser at any given moment, and state(s) of running applications, to namea few.

FIG. 1 also illustrates local user account data 151 _(A-N) and localdevice data 152. The local user account data 151 _(A-N) can include, forexample, user account-specific settings, user account-specificpreferences, and historical automated assistant interaction datadescriptive of historical interactions between corresponding users andthe automated assistant 100 for various user accounts that areassociated with the assistant device 102. The local user account data151 _(A-N) can additionally or alternatively include, for example,accessibility data for each of multiple user accounts (e.g., 151 _(A)can include indications of association(s) that are accessible to a firstuser account, 151 _(B) can include indication(s) of association(s) thatare accessible to a second user account, etc.). Some of theaccessibility data can be applied to corresponding local user accountdata utilizing techniques described herein. In processing a spokenutterance from a given user, local engine(s) 106 (e.g., local STT and/ornatural language processing engine(s)) can utilize such accessibilitydata for one of the user account data 151 _(A-N) that corresponds to thegiven user. The local device data 152 can include settings, preferences,and historical automated assistant interaction data that is applicableto the shared assistant device 102 as a whole. The local engine(s) 106of the assistant device 102 can use the local user account data 151_(A-N) and local device data 152 to perform one or more natural languageprocessing or dialog managing functions described herein.

FIG. 1 also illustrates cloud user account data 161 _(A-N) and clouddevice data 162. The cloud user account data 161 _(A-N) can be similarto (e.g., the same as) the local user account data 151 _(A-N) describedabove, but is utilized by the cloud based automated assistantcomponent(s) 110 instead of the local engine(s) 106. In someimplementations, the cloud user account data 161A-N may additionallyinclude user account data and/or historical automated assistantinteraction data for a plurality of users of the automated assistant 100via one or more other assistant devices. The cloud device data 162 canalso be similar to (e.g., the same as) the local device data 152described above, but is utilized by the cloud based automated assistantcomponent(s) 110 instead of the local engine(s) 106. For example, thecloud based automated assistant component(s) 110, in processing anutterance provided at the assistant device 102, can receive anidentifier of the assistant device 102 and utilize that identifier inaccessing the corresponding cloud device data 162 for the assistantdevice 102. In some implementations, the cloud device data 162 mayadditionally include user device data for a plurality of assistantdevices of other users of the automated assistant 100.

Responsive actions may come in a variety of forms, depending on the userrequest. Responsive actions may be any action that an automatedassistant is capable of performing and/or invoking. Some responsiveactions may be used to control appliances and/or other Internet ofThings (“IoT”) devices, such as lights, locks, thermostats, televisions,speakers, smart blinds, cameras, toys, and so forth. Some responsiveactions may be used to procure items such as products, tickets, food(e.g., ordering pizza), etc. Some responsive actions may be applicationsor “apps” that may be invoked by automated assistants, e.g., withvarious fields pre-populated based on the free-form natural languageinput. Some responsive actions may include retrieval of responsive dataand provision of that responsive data to the user in audio and/or visualform, e.g., in response to search queries. Some responsive actions maybe “intra-app” actions that are performable within an application, suchas starting or stopping monitoring of exercise, pausing/playing mediafiles, sharing locations and/or estimated time of arrival (e.g., via arideshare or cycling app), altering a destination (e.g., via a rideshareapp), and so forth. In the latter case, an application programminginterface (“API”) may be exposed to an automated assistant directlyand/or via an operating system (“OS”), which enables the automatedassistant to perform actions within an application.

If more than one candidate responsive action is identified for a givenuser request, then dialog manager 118 may use data associated with thecandidate responsive actions and the data generated by the naturallanguage processor 116 to clarify which candidate responsive action theautomated assistant 100 should perform based on the user request. Dialogmanager 118 may be configured to determine the candidate responsiveactions (or the intents indicating the candidate responsive actions)based on the data received from natural language processor 116. Dialogmanager 118 may use the various data generated by the natural languageprocessor 116, as well as information retrieved from user account data161 _(A-N), device data 162, or one or more other databases (e.g., overthe internet), to identify the multiple responsive actions and generateone or more clarification prompts for presentation to the user. Forexample, a user may provide a spoken utterance of “Play Boxanne”. Theautomated assistant 100 may process the spoken utterance and determinethat “Boxanne” is the name of a song, but may be unable to determine ifthe user wants to listen to the generally more popular, older version bya band called “the Firefighters” or the newer version by the artist“Arkansas Vegas” which has started trending in the past few days. Asanother example, a user may provide a spoken utterance of “how tall is acrane?”. The automated assistant 100 may process the spoken utteranceand determine that “crane” is equally likely to correspond to twodifferent candidate responsive actions consisting of presentinginformation about a height of industrial machinery frequently used tohoist large objects and presenting information about a height of along-necked bird species of the Gruiform order of birds.

When the automated assistant 100 determines more than one candidateresponsive action corresponds to the spoken utterance, dialog manager118 may provide one of a natural-language (“NL”) only clarificationprompt and an enhanced clarification prompt for presentation to the userdepending on various factors described herein. The clarification promptspresent the candidate responsive actions as options to the user andprompt the user to provide clarifying user input in response to theprompt that may be used to disambiguate between the options.

An NL only clarification prompt is an audible and/or textual promptgenerated to imitate a spoken natural language question or statementthat prompts the user to select between the candidate responsive actionsor to otherwise provide more details about their request that may assistthe system in selecting between the candidate responsive actions. The NLonly clarification prompt includes only natural language, such as anatural language characterization of the candidate responsive actionsand/or their expected results, in order to assist the user indifferentiating between the options. An enhanced clarification promptincludes additional audio or visual content instead of, or in additionto, natural language and, likewise, prompts the user to select betweenthe candidate responsive actions or to otherwise provide more detailsabout their request that may assist the system in selecting between thecandidate responsive actions. The additional audio or visual content mayinclude portions of the various media corresponding to the candidateresponsive actions or may otherwise characterize the candidateresponsive actions or the expected results of the candidate responsiveactions (e.g., an image of a musical note and an image of a projectorpresented to help the user choose between a song and a movie).

In keeping with the “Boxanne” example above, an NL only clarificationprompt from the system may include audio data imitating the naturallanguage question “Did you want the one by the Firefighters or the oneby Arkansas Vegas?”. Whereas, for such an example, an enhancedclarification prompt may be “Do you want this one [insert sound clip #1]or this one [insert sound clip #2]?”, where the [sound clips] arerepresentative audio snippets of the two versions of the song “Boxanne”.A representative audio snippet of a song can, for example, be from achorus of the song (e.g., as indicated by metadata), be a portion of thesong that includes term(s) from the title of the song (e.g., asdetermined using ASR or other technique(s)), and/or be from some otherwell known part of the song (e.g., a portion that is consumed more oftenthan other portions and/or is often consumed at a higher volume thanother portions). In keeping with the “how tall is a crane?” exampleabove, an NL only clarification prompt from the system may include audiodata imitating the natural language question “Do you mean the machineryor the Gruiform?”. Whereas, for such an example, an enhancedclarification prompt may include the question “Which type of crane didyou mean?” with an image of the industrial equipment called a crane andan image of the long-necked bird called a crane displayed on a displayof the assistant device.

The NL only clarification prompt can be generated based on an NL onlyclarification prompt template. The NL only clarification prompt templatemay be pre-generated, or may be generated responsive to identifying thetwo or more candidate responsive actions as corresponding to the user'sspoken utterance. The NL only clarification prompts can include slotsfilled by the natural language characterizations of the candidateresponsive actions to be rendered in the prompt. The system may generatesuch natural language characterizations of the candidate responsiveactions based on data generated during the natural language processingand, in some implementations, information retrieved from one or moreother resources available to the system (e.g., user search or browserhistory, user account profile, historical user data of a plurality ofusers of the system, user-device resources, online resources, etc.).

In some implementations, an NL only clarification prompt may be thedefault clarification prompt used when the automated assistant 100determines it cannot select between two or more candidate responsiveactions for user requests generally, or for certain types of userrequests. However, the automated assistant 100 may instead select anenhanced clarification prompt based on a variety offactor(s)/condition(s) described herein. In other implementations, theremay be no default type of clarification prompt to provide for the userrequest and/or identified candidate responsive actions, and the varietyof factors described herein may lead to the automated assistant 100determining to provide an enhanced clarification prompt rather than anNL only clarification prompt.

FIG. 2 is a flowchart illustrating an example method 200 ofdisambiguating a user request. For convenience, the operations of theflow chart are described with reference to a system that performs theoperations. This system may include various components of variouscomputer systems, such as one or more components of automated assistant100. Moreover, while operations of method 200 are shown in a particularorder, this is not meant to be limiting. One or more operations may bereordered, omitted or added.

At block 252, the system receives, via microphone(s) of an assistantdevice, audio data that captures a spoken utterance of a user.

At block 254, the system processes the audio data to generate arecognition that corresponds to the spoken utterance. The processing mayinclude generating a transcription of the spoken utterance andperforming various natural language processing functions, such asgenerating annotations of the transcription, as described herein.

In some implementations, generating a recognition may further includevoice recognition, e.g., matching a voice detected in the audio data toone or more voice recognition profiles of the user account associatedwith the user. In such implementations, the spoken utterance may beclassified as being spoken by the user associated with the user accountincluding the matching voice recognition profile(s). In someimplementations, the system can attribute the spoken utterance to theparticular user or user account based on historical automated assistantinteraction data that indicates receipt of the spoken utterance islikely associated with that user and/or account. For example, thehistorical automated assistant interaction data may indicate that theassistant device that received the spoken utterance has historicallybeen mainly, only, or most recently used by a particular user oraccount.

At block 256, the system determines, based on processing the recognitionthat corresponds to the spoken utterance, that the spoken utterance isambiguous. The system determines that the spoken utterance is ambiguousbased on determining that the recognition is interpretable as requestingperformance of a first particular action exclusively and also beinginterpretable a second particular action exclusively. In the “Play[Boxanne]” example described above, even though it is clear from theuser's spoken utterance that they wish for only one instance of the song[Boxanne] to begin playing, the system is unable to determine if itshould perform the action corresponding to the request “Play [Boxanne]by [the Firefighters]” or instead perform the action corresponding tothe request “Play [Boxanne] by [Arkansas Vegas]”. When the systemencounters such a situation, it will provide a clarification prompt tothe user requesting clarifying details that may be used to disambiguatebetween the two candidate responsive action options.

At block 258, the system determines to provide an enhanced clarificationprompt that renders additional output that is presented instead of or inaddition to natural language, in lieu of a natural language (NL) onlyclarification prompt that is restricted to rendering natural language.The determination can be made based on determining one or moreconditions are satisfied. Generally, the condition(s) can objectivelyindicate that provision of the NL only clarification prompt: is likelyto result in prolonging of the interaction between the user and theautomated assistant in disambiguating the user utterance (e.g., islikely to result in a further ambiguous input and/or a request forclarification of the NL only clarification prompt); is likely to lead toerrant user input (e.g., due to a misunderstanding of the NL onlyclarification prompt and resulting in an incorrect disambiguation) thatcan cause errant performance of one or more automated assistantaction(s) (e.g., errant and computationally wasteful rendering of thewrong song, errant and computationally wasteful purchasing of the wrongcontent, etc.); and/or is likely to lead to the user abandoning theirintended goal (e.g., the user not responding at all due to not fullyunderstanding the NL only clarification prompt). Accordingly, byconsidering the condition(s), enhanced clarification prompt(s) can beonly selectively provided in those situations where doing so is likelyto result in a shorter duration of interaction between a user and theautomated assistant and/or is likely to lead to the user to providecorrect disambiguating input, is likely to result in the user notabandoning their intended goal, and/or is likely to achieve additionaland/or alternative technical benefit(s).

In some implementations, block 258 can include one or more of sub-blocks259A-D (see FIG. 3 ), in which the system determines to provide theenhanced clarification prompt instead of the NL only clarificationprompt based on one or more of these factors discussed in more detailbelow with respect to FIG. 3 . In some implementations, thedetermination of block 258 may be a prior determination made prior toreceiving the audio data that captures the spoken utterance of the userat block 252. In some implementations, the determination of block 258may be a current determination made subsequent to generating therecognition of the spoken utterance at block 254 or determining that thespoken utterance is ambiguous at block 256.

At block 260, the system causes the clarification prompt to be renderedat an assistant device. In some implementations, causing theclarification prompt to be rendered at an assistant device includesmodifying data at one or more automated assistant servers to cause theNL only clarification prompt to be supplanted by the enhancedclarification prompt.

In some implementations, the clarification prompt is rendered at thesame device which received the audio data from the user. In someimplementations, the system selects another assistant device to providethe clarification prompt based on the received audio data, additionalsensor data generated based on one or more sensors of the assistantdevice, information included in a user account, the additional outputthat is to be included in the clarification prompt, the type of userinput expected to be received in response to the clarification prompt,and the candidate responsive actions. For example, a particularassistant device that includes a screen may be selected based onidentifying an indication in the user account profile associated withthe assistant device that received the audio data that the particularassistant device is a main or preferred assistant device, detecting thatthe user was moving in the direction of the particular assistant devicewhen they spoke the spoken utterance, determining that the additionaloutput includes images that need to be rendered on a display such as oneincluded in or connected to the particular assistant device, ordetermining that a user wish to respond to a clarification promptincluding images by performing a touch input on a touch display such asone included in or connected to the particular assistant device.

At block 262, the system receives further user input responsive to therendering of the clarification prompt. The further user input may bespoken input, textual input, touch input, or electronic signal inputfrom an additional electronic device provided to the assistant devicethat received the initial spoken utterance, the assistant device thatrendered the clarification prompt, or another assistant devicecommunicatively coupled to the assistant device that received theinitial spoken utterance or the assistant device that rendered theclarification prompt.

At block 264, the system processes the further user input to determineto perform the first particular action instead of the second particularaction. In the case of touch input, the system may determine to performthe first particular action instead of the second particular actionbased on identifying a location on the display that was indicated by thetouch input and that corresponds to a location at or closest to whereone of the two or more characterizations of the options presented to theuser was rendered. In the case of spoken input or textual input, arecognition or transcription may be generated, as discussed above withrespect to the initial spoken utterance, and the system may performnatural language processing to determine which option of the two or moreoptions rendered that correspond to candidate responsive actions thespoken input corresponds to, if any. In the case of electronic signalinput received from an additional electronic device, the system maydetermine number(s), letter(s), word(s), phrase(s), location(s) on thedisplay, or temporal location(s) of the input received with respect tothe prompt (e.g., after the first option is presented but before thesecond option is presented) that correspond to the electronic signalinput in order to identify which presented option the further user inputcorresponds to.

For some of these forms of further user input, the system can compareone or more properties indicated by the further user input to one ormore properties associated with the candidate responsive actionscorresponding to the renderings in the clarification prompt. The one ormore properties associated with the candidate responsive actionscorresponding to the renderings in the clarification prompt may beobtained, for example, from a knowledge graph or one or more otheroutside resources available to the system, e.g., over the internet. Oneor more properties associated with a candidate responsive action and/orwith media presented in an enhanced clarification prompt canadditionally or alternatively be determined (in advance or “live”) usingone or more machine learning models. For example, a property of an imagepresented in an enhanced clarification prompt can include term(s) from acaption generated automatically by processing the image using a machinelearning model and/or a property of a representative audio snippet of asong presented in an enhanced clarification prompt can include term(s)from the snippet of the song that are automatically determined based onperforming ASR on the snippet of the song. The one or more propertiesmay include properties of the candidate responsive actions, propertiesof the media presented to the user in the rendering of the enhancedclarification prompt (e.g., descriptors of: content or type of contentincluded in or with the audio/video snippets or images, the general orrelative location on the display, the temporal positions of given mediarenderings, the source of the media used in the renderings, etc.),properties of one or more entities, services, devices, and/or previousinteractions with the automated assistant that are associated with thecandidate responsive actions or the content included in the renderings(e.g., “the one I played on Music App last night”, “the one by theartist with black hair”, “the one that I downloaded to my offlineplaylist on my phone”, etc.), or combinations thereof.

In some implementations, at block 264, the system may process thefurther user input to identify a semantic property (e.g., “upbeat”,“new”, “black hair”, etc.) that is referenced by the further user input.In such implementations, the system can generate an embedding based onthe identified semantic property (e.g., using a trained neural networkencoder) and compare the embedding to a plurality of embeddings ofrespective semantic properties associated with the candidate responsiveactions corresponding to the renderings of the clarification prompt. Theplurality of embeddings of respective semantic properties associatedwith the candidate responsive actions may have been generated by thetrained neural network encoder or another trained neural network encoderbased on metadata that indicates semantic properties associated with thecandidate responsive actions. Further, the system can determine that thegiven semantic property matches, or most closely matches, a givenembedding, of the plurality of embeddings of the respective semanticproperties, based on the comparison. For example, assume the embeddingsare word2vec representations. In this example, a cosine distance betweenthe word2vec representation of the semantic property and each of theword2vec representations of the respective semantic properties of thecandidate responsive actions of the prompt can be determined, and agiven semantic property of a candidate responsive action that isassociated with a respective cosine distance that satisfies a distancethreshold can be utilized to determine the semantic property of thespoken utterance matches, or most closely matches, the given semanticproperty that is associated with a given candidate responsive action(e.g., an exact match or “fuzzy” match). As a result, the givencandidate responsive action that is associated with the given semanticproperty may be selected for performance.

In some implementations, block 264 may include one or more of sub-blocks265A, 265B, or 265C, depending on the type of content included in theclarification prompt and/or the type of input that was provided by theuser in response to the clarification prompt.

The system may determine, at block 265A, that the further user inputreferences a temporal position of a particular portion of the additionaloutput. In keeping with the “Boxanne” example above, the system rendersthe enhanced clarification prompt. For example, the enhancedclarification prompt can be “Do you want this one [insert sound clip #1]or this one [insert sound clip #2]?”, where the [sound clips] arerepresentative audio snippets of the two versions of the song “Boxanne”.As another example, the enhanced clarification prompt can be “Do youwant [Label #1] [insert sound clip #1] or [Label #2] [insert sound clip#2]?”, where the [sound clips] are again representative audio snippetsof the two versions of the song “Boxanne”, where [Label #1] includes aproperty (e.g., artist, release date, genre) of the first version of thesong that is not also a property of the second version of the song, andwhere [Label #2] includes a property of the second version of the songthat is not also a property of the first version of the song. Providing,in the enhanced clarification prompt, a unique label for one or more ofthe options can teach users about distinction(s) between the optionsand/or can provide an explicit cue for further user input that can beused to differentiate between the options. Responsive to this rendering,the user provides further user input in the form of a spoken utteranceof “the first one”. Block 265A may be performed, and the first action(rendering the first song) can be selected and implemented since “first”references the rendering order, in the enhanced clarification prompt,for the first song snippet that corresponds to the first action.

The system may determine at block 265B that the further user input ofthe user references a musical property associated with a portion of theclarification prompt corresponding to a rendering of particularcandidate responsive action and not corresponding to the rendering ofthe other particular candidate responsive actions. For example, when thesystem receives a responsive spoken utterance of “the more upbeat one”or “I want the vegan doom-metal version”, then block 265B may beperformed. In some implementations, the determination(s) of block 265Bmay be performed based on comparing the musical property referenced bythe further user input to metadata associated with the first and secondcandidate responsive actions and/or their renderings in theclarification prompt. Thus, for example, after rendering two differentrepresentative audio snippets corresponding to two different songs inthe clarification prompt, the system may select and implement the firstaction (rendering the first song) based on metadata associated with thefirst song indicating it is higher tempo than is the second song, asindicated by separate metadata associated with the second song. As yetanother example, if the further user input is “the one with the acousticguitar”, the second action (rendering the second song) can be selectedand implemented based on metadata associated with the first songindicating it includes an acoustic guitar and/or based on metadataassociated with the second song indicating it does not include anacoustic guitar.

The system may determine at block 265C that the further user input ofthe user corresponds to a rendering of a particular candidate responsiveaction consisting of an image. For example, when the system receives atouch input corresponding to a location on a touchscreen of an imagecorresponding to a particular candidate responsive action, then block265C may be performed.

At block 266, the system causes performance of the first particularaction.

Turning now to FIG. 3 , it is a flowchart illustrating exampleimplementations of block 258 of FIG. 2 .

At block 259A, the system determines a frequency of occurrence, of atleast one term of one or more terms of the NL only clarification promptthat describes a first candidate responsive action, across a corpus ofdocuments. The NL only clarification prompts can include slots filled bythe natural language characterizations of the candidate responsiveactions to be rendered in the prompt. The system may generate suchnatural language characterizations of the candidate responsive actionsbased on data generated during the natural language processing and, insome implementations, information retrieved from one or more otherresources available to the system. Each natural languagecharacterization for a candidate responsive action includes one or moreterms describing that candidate responsive action.

The NL only clarification prompt can be generated based on an NL onlyclarification prompt template. The NL only clarification prompt templatemay be pre-generated, or may be generated responsive to identifying thetwo or more candidate responsive actions as corresponding to the user'sspoken utterance. In the case of pre-generated NL only clarificationprompt templates, the NL only clarification prompt template can beselected from among various NL only clarification templates based on theidentified two or more candidate responsive actions that correspond tothe user's spoken utterance. For example, there may be NL onlyclarification prompt templates for online shopping, viewing orretrieving media content, interactions with a restaurant reservationapplication, booking flights, etc. There may also be NL onlyclarification prompt templates for the various combinations of suchactions, e.g., a clarification prompt for selecting between an onlineshopping action and a flight booking action. In some implementations,the NL only clarification prompt template may be selected from amongvarious NL only clarification templates at least in part based on thenatural language characterizations of the candidate responsive actionsto be rendered in the prompt. For example, if the clarification promptis to include natural language characterizations of candidate responsiveactions that are detailed and/or long-winded, then an NL onlyclarification prompt template that includes long pauses before and/orafter the characterizations or that provides a summary at the end may beselected. In implementations in which the NL only clarification prompttemplate is generated after receiving the spoken utterance, it maylikewise be tailored to the candidate responsive actions and/or theircharacterizations that are to be rendered in the clarification prompt.

The system, at block 259A, determines the frequency at which one or moreof the terms of the natural language characterizations of the candidateresponsive actions occur in a corpus of documents. The system can usethis frequency to determine to provide the enhanced clarification promptrather than the NL only clarification prompt. In some implementations,the frequency determined at block 259A may be an inverse documentfrequency (IDF). In such implementations, one or more of the first termsor the second terms will have a high IDF if they occur rarely across thecorpus of documents. In various implementations, the corpus of documentsmay be selected based on the respective candidate responsive actiondescribed by the term(s), based on the one or more terms describing therespective candidate responsive action, and/or based on a user accountassociated with the user that provided the spoken utterance.

In some implementations, the system may determine, at block 258, toprovide the enhanced clarification prompt when one or more of the termsoccur frequently in the corpus of documents, e.g., indicating theterm(s) may describe several unrelated actions or concepts. In someimplementations, the system may determine to provide the enhancedclarification prompt when one or more of the terms occur infrequently inthe corpus of documents, e.g., indicating the term(s) may be uncommonways of characterizing the first candidate responsive action and/or thatthe user is unlikely to be familiar with the term(s). In keeping withthe “how tall is a crane?” example above, an NL only clarificationprompt from the system may include audio data imitating the naturallanguage question “Do you mean the machinery or the Gruiform?”. Whereas,for such an example, an enhanced clarification prompt may include thequestion “Which type of crane did you mean?” with an image of theindustrial equipment called a crane and an image of the long-necked birdcalled a crane displayed on a display of the assistant device. In thisexample, the system may determine, at block 258, to provide the enhancedclarification prompt in lieu of the NL only clarification prompt basedon determining that one or more metrics associated with the term“Gruiform” indicate that it is unlikely to be recognized and/orunderstood. For example, the metric(s) can include that it has a highIDF within a relevant corpus of documents, that it has never beenutilized by the user (e.g., in search(es), email(s), and/or other userinput(s)), and/or that it has been utilized by the user less than athreshold quantity of times.

At block 259B, the system determines, based on an analysis of historicalautomated assistant interaction data, a failure metric for an NL onlyclarification prompt generated and/or selected as described above withrespect to block 259A. The historical automated assistant interactiondata employed at block 259B may be historical automated assistantinteraction data of the user, e.g., from local or remote user accountdatabases 151A-N and 161A-N, and/or historical automated assistant datafor a population of user, e.g., from remote user account database 161A-Nor another remote user account database accessible to the system. The NLonly clarification prompt, a portion of the NL only clarification prompt(e.g., the natural language characterization of a candidate responsiveaction or the template), or portion(s) of an NL only clarificationprompt including similar features (e.g., pauses between optionpresentations or types of descriptors used in the natural languagecharacterizations) may have been provided to one or more userspreviously, and the system may analyze the interactions between theuser(s) and the automated assistant occurring shortly before and shortlyafter presentation of the clarification prompt to determine a failuremetric for the prompt.

Block 259B can include one or more of sub-blocks 259B1 and 259B2. Atsub-block 259B1, the system determines that the failure metric satisfiesa threshold. In various implementations, the failure metric is a totalnumber of failures, a total number of failures within a time period, afailure rate, or some combination thereof.

At sub-block 259B2, the system determines, from the historical automatedassistant interaction data (for the user and/or a population of users),a quantity of occurrences of non-clarifying user input and/or of no userinput responsive to prior automated assistant renderings that correspondto the NL only clarification prompt. Prior automated assistantrenderings that correspond to the NL only clarification prompt caninclude those that strictly conform to the NL only clarification prompt,those that utilize the same template as the NL only clarificationprompt, those that reference one or more of the same genre(s) and/orartist(s) of the NL only clarification prompt, those that include one ormore of the same term(s) as the NL only clarification prompt, and/orthose that otherwise correspond to the NL only clarification prompt.Accordingly, metric(s) determined at sub-block 259B2 can be specific tothe particular NL only clarification prompt and/or can be applicable tomultiple NL only clarification prompts (e.g., those generated using thesame template, those referencing the same artist(s), etc.), includingthe particular NL only clarification prompt. For example, the system mayidentify occurrences in which no user input was provided in response tothe clarification prompt, portions of the clarification prompt, orportions of clarification prompts containing similar features oroccurrences in which the user input provided in response to theclarification prompt, portions of the clarification prompt, or portionsof clarification prompts containing similar features cannot be resolvedas corresponding to any one natural language characterizationcorresponding to a candidate responsive action.

For example, assume the NL only clarification prompt is “Do you want tohear the one by First Hypothetical Artist or the one by SecondHypothetical Artist?”. The enhanced clarification can be chosen over theNL only prompt at block 258 if historical data reflects a large quantityof occurrences of corresponding users not responding to instances of theNL only clarification prompt (or similar NL only clarification prompts),responding with non-clarifying user input (e.g., “I don't know”, “whichis which”, “huh”, etc.), and/or choosing the incorrect one (e.g., asreflected by a quick cancelling of the rendering of the selected song,and optionally a subsequent request to play the non-selected song). Thesystem can thus determine to provide the enhanced clarification promptrather than the NL only clarification prompt at block 258 based on thequantity or frequency of the NL only clarification prompt failing, e.g.,indicating that users do not understand the options presented, do notunderstand how to select an option presented, or are annoyed or bored bythe content or format of the prompt.

In some implementations, determining to provide the enhancedclarification prompt in lieu of the NL only clarification promptquantity is based on the quantity and/or frequency, of the NL onlyclarification prompt failing, satisfying threshold(s). In some of thoseimplementations, the threshold(s) can be dependent on whichcomputational resources and/or other resources would be consumed as aresult of an errant performance of the wrong action due to usermisunderstanding of an NL only clarification prompt and/or an extent ofutilization of such resource(s). For example, a less stringent threshold(i.e., more likely to result in an enhanced clarification prompt beingprovided) can be utilized if the actions being disambiguated would eachlead to three or more minutes of audio being streamed and rendered,whereas a more stringent threshold can be utilized if the actions beingdisambiguated would each only lead to less than ten seconds of audiobeing streamed and rendered. As another example, a less stringentthreshold can be utilized if one or more of the actions beingdisambiguated would lead to a purchase (that may not be reversible, orwould be computationally burdensome to reverse), whereas a morestringent threshold can be utilized if none of the actions beingdisambiguated would lead to a purchase.

More generally, determining whether to provide an enhanced clarificationprompt in lieu of an NL only clarification prompt can be based on whichcomputational resources and/or other resources would be consumed as aresult of an errant performance of the wrong action due to usermisunderstanding of the NL only clarification prompt and/or an extent ofutilization of such resource(s). As one example, enhanced clarificationprompts may not even be considered for NL only prompts where errantperformance of the wrong action would not lead to a purchase and/orwould result in less than a threshold extent of usage of networkresources. As another example, an enhanced clarification prompt can beprovided in lieu of a first NL only clarification prompt that includesrare term(s) based on the first NL only clarification promptdisambiguating between two computationally burdensome actions, but notprovided in lieu of a second NL only clarification prompt that alsoincludes the rare term(s) based on the second NL only clarificationprompt disambiguating between two non-computationally burdensomeactions. As yet another example, assume an NL only clarification promptof “The one by the Firefighters or the one by Arkansas Vegas?”. Anenhanced clarification prompt can be provided in lieu of the NL onlyclarification prompt in response to user input of “Play Boxanne” sincethe resulting actions (playing a first song or playing a second song)both involve streaming and rendering of a large amount of audio data. Onthe other hand, the NL only clarification prompt can be provided inresponse to user input of “Boxanne lyrics” since the resulting actions(transmitting and rendering lyrics for the first song or the secondsong) involve transmitting a smaller amount of data and/or rendering thedata for a shorter duration.

At block 259C the system classifies the spoken utterance as being spokenby a particular user account or particular user associated with aparticular account. The system can associate the spoken utterance withthe user account based on a voice recognition profile of the userassociated with the user account by performing voice recognitionprocessing on audio data including the spoken utterance. In someimplementations, the system can attribute the spoken utterance to theparticular user or user account based on historical automated assistantinteraction data that indicates receipt of the spoken utterance islikely associated with that user and/or account. For example, thehistorical automated assistant interaction data may indicate that theassistant device that received the spoken utterance has been mainly,only, or most recently used by a particular user or account. In someimplementations, the system can classify the spoken utterance as beingspoken by a particular user account or particular user associated with aparticular account based on sensor data of the assistant device that isin addition to the audio sensor data capturing the spoken utterance. Forexample, the system may classify the utterance as being spoken by theparticular user/account based on comparing vision sensor data to one ormore facial recognition profiles associated with the assistant device orbased on detecting nearby devices associated with the user/account usingBluetooth, ultrasonic audio, and/or Wi-Fi.

Block 259C can include sub-block 259C1. At sub-block 259C1, the systemidentifies attributes associated with the particular user account orparticular user associated with a particular account. The attributes caninclude user settings, user preferences, the user device(s) associatedwith the automated assistant system, automated assistant featuresenabled for or used by the user, and applications installed on the userdevice(s). In some implementations, the attributes can include an age ofthe user or a language ability of the user. For example, the attributesmay indicate that a particular user who provided the spoken utterance isa child with a fifth-grade reading level. The system can then determineto provide the enhanced clarification prompt rather than the NL onlyclarification prompt at block 258 based on the attributes and/or otherdata associated with the user or user account indicating that theenhanced clarification prompt may be more appropriate for the user,e.g., based on a user's abilities and familiarity with certain featuresof the clarification prompt(s).

In some implementations, the attributes can be identified by performingvoice recognition on the audio data including the spoken utterance andidentifying attributes stored in association with a user account profilethat includes a voice recognition profile for the particular user. Insome implementations, the attributes can be identified by processing thehistorical automated assistant interaction data and/or comparing thehistorical automated assistant interaction data to historical automatedassistant interaction data of other users of other devices. For example,the system may compare the spoken utterances, requests, and responses ofa user during a given type of human-to-computer dialog session to thespoken utterances, requests, and responses of a plurality of other usersin the same or similar types of human-to-computer dialog sessions whoeach have user attributes stored in association with their user accountprofiles. Based on this comparison, the system can assign certainattributes to a user or user account.

For example, the system can determine to provide the enhancedclarification prompt rather than the NL only clarification prompt atblock 258 based on the attributes associated with the user/accountindicating that the user one or more familiarity measures indicatingproficiency with musical, cinematic, sports, etc. domains fail tosatisfy one or more thresholds. The familiarity measure(s) failing tosatisfy the corresponding threshold(s) may indicate that the user mayhave difficulty identifying or recognizing descriptors for candidateresponsive actions related to that domain. In such an example, thesystem may have assigned these low levels of proficiency to a user basedon recognizing that the user inaccurately describes or infrequentlyrequests actions that correspond to each proficiency category.

As another example, in keeping with the “how tall is a crane?” exampleabove, an NL only clarification prompt from the system may include audiodata imitating the natural language question “Do you mean the machineryor the Gruiform?”. Whereas, for such an example, an enhancedclarification prompt may include the question “Which type of crane didyou mean?” with an image of the industrial equipment called a crane andan image of the long-necked bird called a crane displayed on a displayof the assistant device. For such an example, the system can determine,at block 258, to provide the enhanced clarification prompt including theimages rather than providing the NL only clarification prompt based ondetermining that the user's age and/or language abilities are associatedwith: historically better rates of success or responsiveness to enhancedclarification prompts in general compared to NL only clarificationprompts in general, historically better rates of success orresponsiveness to similar enhanced clarification prompts compared tosimilar NL only clarification prompts, relative low ability tounderstand or repeat the terms to be included in the NL onlyclarification prompt, relatively short attention span, etc. The systemmay have made such determinations about associations with a user's ageand/or language abilities based on analyzing historical automatedassistant interaction data for a plurality of users with similar agesand/or language abilities.

At block 259D, the system compares one or more first term(s) of the NLonly clarification prompt that characterize a first candidate responsiveaction to one or more second term(s) of the NL only clarification promptthat characterize a second candidate responsive action. As discussedherein, the NL only clarification prompts can include slots filled bythe natural language characterizations of the candidate responsiveactions to be rendered in the prompt. Each natural languagecharacterization for a candidate responsive action can include one ormore terms describing that candidate responsive action.

Block 259D can include one or more of sub-blocks 259D1 and 259D2. Atsub-block 259D1, the system determines a similarity measure thatreflects a textual and/or semantic similarity between the first term(s)and the second term(s). At sub-block 259D2, the system can embed thefirst term(s) as a first embedding in an embedding space and can embedthe second term(s) as a second embedding in the embedding space using atrained encoder (e.g., a trained neural network embedding model). Insome implementations, the system can use the embeddings of sub-block259D2 to generate the similarity measure of sub-block 259D1.

The system can thus determine to provide the enhanced clarificationprompt rather than the NL only clarification prompt at block 258 basedon the comparison(s) of the embeddings of the first and second termsand/or based on the similarity measure. For example, in requesting forthe user to clarify which version of a song they are attempting to play,the system may determine to play representative audio snippets of thesong versions rather than render an NL only clarification prompt basedon the available descriptors of the song versions being too semanticallysimilar, e.g., “House music” and “Electronic Dance music”, or toosemantically dissimilar, potentially indicating that the descriptors areunrelated or otherwise not comparable, e.g., “released in 1999” and“up-tempo”. The system may determine the descriptors are toosemantically similar/dissimilar based on analyzing the distance betweenthe embeddings for the first term(s) and the second term(s). Thus, atblock 258, the system may determine to provide the enhancedclarification prompt rather than the NL only clarification prompt basedon determining that the similarity measure and/or embeddings indicatethreshold level(s) of similarity and/or dissimilarity.

In some of the implementations of FIG. 3 in which the NL onlyclarification prompt template(s) and/or natural languagecharacterizations of the candidate responsive actions have previouslybeen generated, for this user or for another user as indicated by thehistorical automated assistant interaction data, one or more of theseexample implementations of block 258 of FIG. 2 may be performed prior tothe system receiving the audio data that captures the spoken utteranceof the user at block 252 of FIG. 2 . In such implementations, the systemmay store the result(s) of one or more of blocks 259A-259D in one ormore databases accessible to the system, and the system may referencethe result(s) of the database in performing block 258.

FIG. 4 is a block diagram of an example computing device 410 that mayoptionally be utilized to perform one or more aspects of techniquesdescribed herein. In some implementations, one or more of a clientcomputing device, and/or other component(s) may include one or morecomponents of the example computing device 410.

Computing device 410 typically includes at least one processor 414 whichcommunicates with a number of peripheral devices via bus subsystem 412.These peripheral devices may include a storage subsystem 424, including,for example, a memory subsystem 425 and a file storage subsystem 426,user interface output devices 420, user interface input devices 422, anda network interface subsystem 416. The input and output devices allowuser interaction with computing device 410. Network interface subsystem416 provides an interface to outside networks and is coupled tocorresponding interface devices in other computing devices.

User interface input devices 422 may include a keyboard, pointingdevices such as a mouse, trackball, touchpad, or graphics tablet, ascanner, a touchscreen incorporated into the display, audio inputdevices such as voice recognition systems, microphones, and/or othertypes of input devices. In general, use of the term “input device” isintended to include all possible types of devices and ways to inputinformation into computing device 410 or onto a communication network.

User interface output devices 420 may include a display subsystem, aprinter, a fax machine, or non-visual displays such as audio outputdevices. The display subsystem may include a cathode ray tube (“CRT”), aflat-panel device such as a liquid crystal display (“LCD”), a projectiondevice, or some other mechanism for creating a visible image. Thedisplay subsystem may also provide non-visual display such as via audiooutput devices. In general, use of the term “output device” is intendedto include all possible types of devices and ways to output informationfrom computing device 410 to the user or to another machine or computingdevice.

Storage subsystem 424 stores programming and data constructs thatprovide the functionality of some or all of the modules describedherein. For example, the storage subsystem 424 may include the logic toperform selected aspects of one or more of the methods described herein,and/or to implement various components depicted herein.

These software modules are generally executed by processor 414 alone orin combination with other processors. Memory 425 used in the storagesubsystem 424 can include a number of memories including a main randomaccess memory (“RAM”) 430 for storage of instructions and data duringprogram execution and a read only memory (“ROM”) 432 in which fixedinstructions are stored. A file storage subsystem 426 can providepersistent storage for program and data files, and may include a harddisk drive, a floppy disk drive along with associated removable media, aCD-ROM drive, an optical drive, or removable media cartridges. Themodules implementing the functionality of certain implementations may bestored by file storage subsystem 426 in the storage subsystem 424, or inother machines accessible by the processor(s) 414.

Bus subsystem 412 provides a mechanism for letting the variouscomponents and subsystems of computing device 410 communicate with eachother as intended. Although bus subsystem 412 is shown schematically asa single bus, alternative implementations of the bus subsystem may usemultiple busses.

Computing device 410 can be of varying types including a workstation,server, computing cluster, blade server, server farm, or any other dataprocessing system or computing device. Due to the ever-changing natureof computers and networks, the description of computing device 410depicted in FIG. 4 is intended only as a specific example for purposesof illustrating some implementations. Many other configurations ofcomputing device 410 are possible having more or fewer components thanthe computing device depicted in FIG. 4 .

In situations in which the systems described herein collect personalinformation about users (or as often referred to herein,“participants”), or may make use of personal information, the users maybe provided with an opportunity to control whether programs or featurescollect user information (e.g., information about a user's socialnetwork, social actions or activities, profession, a user's preferences,or a user's current geographic location), or to control whether and/orhow to receive content from the content server that may be more relevantto the user. Also, certain data may be treated in one or more waysbefore it is stored or used, so that personal identifiable informationis removed. For example, a user's identity may be treated so that nopersonal identifiable information can be determined for the user, or auser's geographic location may be generalized where geographic locationinformation is obtained (such as to a city, ZIP code, or state level),so that a particular geographic location of a user cannot be determined.Thus, the user may have control over how information is collected aboutthe user and/or used.

In some implementations, a method performed by processor(s) is providedthat includes receiving audio data that captures a spoken utterance of auser. The method further includes generating, based on processing theaudio data, a recognition that corresponds to the spoken utterancecaptured in the audio data. The method further includes determining,based on processing the recognition, that the spoken utterance isambiguous. Determining that the spoken utterance is ambiguous includesdetermining that the recognition is interpretable as requestingperformance of a first particular action exclusively and is alsointerpretable as requesting performance of a second particular actionexclusively. The method further includes, in response to determiningthat the spoken utterance is ambiguous: determining to provide anenhanced clarification prompt that renders output that is in addition tonatural language. The enhanced clarification prompt solicits furtheruser interface input for disambiguating between the first particularaction and the second particular action. Determining to provide theenhanced clarification prompt includes a current or prior determinationto provide the enhanced clarification prompt instead of a naturallanguage (NL) only clarification prompt that is restricted to renderingnatural language. The method further includes causing the clarificationprompt to be rendered at the assistant device.

The foregoing and other implementations disclosed herein can eachoptionally include one or more of the following features, alone or incombination.

In some implementations, the current or prior determination to providethe enhanced clarification prompt instead of the NL only clarificationprompt can be a prior determination. In some of those implementations,the method further includes determining, prior to receiving the audiodata, to provide the enhanced clarification prompt instead of the NLonly clarification prompt.

In some implementations, determining to provide the enhancedclarification prompt instead of the NL only clarification promptincludes: determining, based on analysis of historical automatedassistant interaction data, a failure metric for the NL onlyclarification prompt; determining that the failure metric satisfies athreshold; and in response to determining that the failure metricsatisfies the threshold: modifying data at one or more automatedassistant servers to cause the NL only clarification prompt to besupplanted by the enhanced clarification prompt. In some versions ofthose implementations, determining the failure metric includes:determining, from the historical automated assistant interaction data, aquantity of occurrences of non-clarifying user input and/or of no userinput responsive to prior automated assistant renderings that correspondto the clarification prompt. In some additional or alternativeimplementations, the clarification prompt is generated based on aclarification template and the prior automated assistant renderings thatcorrespond to the clarification prompt include renderings of theclarification prompt and include renderings of additional clarificationprompts that are also generated based on the clarification template. Insome such implementations, the prior automated assistant renderings thatcorrespond to the clarification prompt consist of renderings of theclarification prompt. In some additional or alternative implementations,the method further includes determining the threshold based on one ormore first properties of the first action and/or based on one or moreproperties of the second action. In some of those additional oralternative implementations, the one or more first properties reflectcomputational and/or network burden of the first action and/or whetherthe first action results in a purchase.

In some implementations, the current or prior determination to providethe enhanced clarification prompt instead of the NL only clarificationprompt is a current determination. In some versions of thoseimplementations, the method further includes: generating the NL onlyclarification prompt, where the NL only clarification prompt includesone or more first terms that are descriptive of the first action and oneor more second terms that are descriptive of the second action;comparing the one or more first terms to the one or more second terms;and determining, based on the comparing, to provide the enhancedclarification prompt instead of the NL only clarification prompt. Insome versions of those implementations, comparing the one or more firstterms to the one or more second terms includes generating a similaritymeasure that reflects textual and/or semantic similarity between the oneor more first terms and the one or more second terms and determining,based on the comparing, to provide the enhanced clarification promptinstead of the NL only clarification prompt, includes determining thatthe similarity measure indicates at least a threshold degree ofsimilarity. In some of those versions, generating the similarity measureincludes: processing the one or more first terms, utilizing a trainedencoder, to generate a first embedding; processing the one or moresecond terms, utilizing a trained encoder, to generate a secondembedding; and generating the similarity measure based on a distance, inembedding space, between the first embedding and the second embedding.In some additional or alternative implementations, the method furtherincludes determining the threshold degree of similarity based on one ormore first properties of the first action and/or based on one or moreproperties of the second action. In some of those additional oralternative implementations, the one or more first properties reflectcomputational and/or network burden of the first action and/or whetherthe first action results in a purchase.

In some implementations, the current or prior determination to providethe enhanced clarification prompt instead of the NL only clarificationprompt is a current determination, and the method further includes:generating the NL only clarification prompt, where the NL onlyclarification prompt includes one or more first terms that aredescriptive of the first action; determining that a frequency, of atleast one of the first terms and across a corpus of documents, fails tosatisfy a threshold frequency; and determining, based on the frequencyfailing to satisfy the threshold frequency, to provide the enhancedclarification prompt instead of the NL only clarification prompt. Insome additional or alternative implementations, the method furtherincludes determining the threshold frequency based on one or more firstproperties of the first action and/or based on one or more properties ofthe second action. In some of those additional or alternativeimplementations, the one or more first properties reflect computationaland/or network burden of the first action and/or whether the firstaction results in a purchase.

In some implementations, the current or prior determination to providethe enhanced clarification prompt instead of the NL only clarificationprompt is a current determination, and the method further includes:classifying, based on processing the audio data or additional sensordata captured at the assistant device, the spoken utterance as beingspoken by a particular user account; and determining, based on one ormore attributes stored in association with the particular user account,to provide the enhanced clarification prompt instead of the NL onlyclarification prompt. In some versions of those implementations, thefirst particular action is causing rendering of a first song, the secondparticular action is causing rendering of a second song that is distinctfrom the first song, the one or more attributes reflect a musicalproficiency measure of the user, and determining to provide the enhancedclarification prompt instead of the NL only clarification prompt basedon the one or more attributes includes: selecting the enhancedclarification prompt in response to the familiarity measure failing tosatisfy a threshold that indicates a threshold degree of musicalproficiency. In some other versions of those implementations, the one ormore attributes reflect an age category of the user, and determining toprovide the enhanced clarification prompt instead of the NL onlyclarification prompt based on the one or more attributes includes:selecting the enhanced clarification prompt in response to the agecategory being a particular category. In some of these implementations,the output rendered by the enhanced clarification prompt can include oneor more images.

In some implementations, the first particular action is causingrendering of a first song, the second particular action is causingrendering of a second song that is distinct from the first song, and theoutput rendered by the enhanced clarification prompt includes a snippetfrom the first song and a snippet from the second song.

In some implementations, the method further includes receiving furtheruser input responsive to rendering of the clarification prompt;processing the further user input to determine to perform the firstparticular action instead of the second particular action; and causingperformance of the first particular action. In some versions of thoseimplementations, the output rendered by the enhanced clarificationprompt includes a first portion that includes one or both of a firstimage corresponding to the first action and a first musical snippetcorresponding to the first action and a second portion that includes oneor both of a second image corresponding to the second action and asecond musical snippet corresponding to the second action. The firstportion is rendered temporally before the second portion, the furtheruser input is a further spoken utterance that references a temporalposition, and processing the further user input to determine to performthe first particular action instead of the second particular actionincludes determining to perform the first action based on determiningthat the temporal position, referenced by further spoken utterance,corresponds to the rendering of the first portion. In some otherversions of those implementations, the output rendered by the enhancedclarification prompt includes a first portion that includes a firstmusical snippet corresponding to the first action and a second portionthat includes a second musical snippet corresponding to the secondaction, the further user input is a further spoken utterance thatreferences a musical property, and processing the further user input todetermine to perform the first particular action instead of the secondparticular action includes determining the musical property, referencedin the further spoken utterance, matches the first musical snippet anddoes not match the second musical snippet. In some of those otherversions, determining the musical property matches the first musicalsnippet and does not match the second musical snippet includes comparingthe musical property to first metadata for the first musical snippet andto second metadata for the second musical snippet. In yet other versionsof those implementations, the output rendered by the enhancedclarification prompt includes a first image corresponding to the firstaction and a second image corresponding to the second action visuallyrendered at the same time, the further user input is a touch input beingdirected at the first image, and processing the further user input todetermine to perform the first particular action instead of the secondparticular action includes determining to perform the first particularaction based on the touch input being directed to the first image thatcorresponds to the first action.

Other implementations may include a non-transitory computer-readablestorage medium storing instructions executable by one or more processors(e.g., central processing unit(s) (CPU(s)), graphics processing unit(s)(GPU(s)), and/or tensor processing unit(s) (TPU(s)) to perform a methodsuch as one or more of the methods described above and/or elsewhereherein. Yet other implementations may include a system of one or morecomputers that include one or more processors operable to execute storedinstructions to perform a method such as one or more of the methodsdescribed above and/or elsewhere herein.

What is claimed is:
 1. A method implemented by one or more processors,the method comprising: processing audio data that is detected via one ormore microphones of an automated assistant device and that captures auser utterance; identifying, based on the processing of the audio data,one or more words corresponding to the user utterance; determining,based on processing the words corresponding to the user utterance, thatthe words correspond with initiation of a first particular actionexclusively and with initiation of a second particular actionexclusively; in response to determining that the words correspond withinitiation of the first particular action exclusively and with thesecond particular action exclusively: determining whether, in solicitingfurther user interface input for disambiguating between the firstparticular action and the second particular action, to provide a naturallanguage (NL) only clarification prompt that is restricted to renderingNL, or to instead provide an enhanced clarification prompt that rendersNL and renders output that is in addition to NL; and causing thedetermined one of the NL only clarification prompt or the enhancedclarification prompt to be rendered at the assistant device.
 2. Themethod of claim 1, wherein determining whether to provide the NL onlyclarification prompt, or to instead provide the enhanced clarificationprompt, is performed prior to processing the audio data.
 3. The methodof claim 1, wherein determining whether to provide the NL onlyclarification prompt, or to instead provide the enhanced clarificationprompt further comprises: identifying, based on analysis of historicalautomated assistant interaction data, a failure metric for the NL onlyclarification prompt; and determining whether the failure metricsatisfies a threshold.
 4. The method of claim 3, wherein determining thefailure metric comprises: determining, from the historical automatedassistant interaction data, a quantity of occurrences of non-clarifyinguser input and/or of no user input responsive to prior automatedassistant renderings that correspond to the NL only clarificationprompt.
 5. The method of claim 4, wherein the NL only clarificationprompt is generated based on a clarification template, and wherein theprior automated assistant renderings that correspond to the NL onlyclarification prompt comprise renderings of the NL only clarificationprompt and renderings of additional prompts that are also generatedbased on the clarification template.
 6. The method of claim 4, whereinthe prior automated assistant renderings that correspond to the NL onlyclarification prompt consist of renderings of the NL only clarificationprompt.
 7. The method of claim 1, determining that a frequency, of atleast one of the first terms and across a corpus of documents, fails tosatisfy a threshold frequency; wherein determining whether to providethe NL only clarification prompt or the enhanced clarification prompt isfurther based on the frequency failing to satisfy the thresholdfrequency.
 8. The method of claim 1, further comprising: classifying,based on processing the audio data or additional sensor data captured atthe assistant device, the user utterance as corresponding to aparticular user account; wherein determining whether to provide the NLonly clarification prompt or to provide the enhanced clarificationprompt is further based on one or more attributes stored in associationwith the particular user account.
 9. The method of claim 8, wherein theone or more attributes reflect an age category of the user, and whereindetermining, based on the one or more attributes, whether to provide theNL only clarification prompt or to provide the enhanced clarificationprompt further comprises: selecting the prompt in response to the agecategory being a particular category.
 10. The method of claim 1, whereinthe output, of the enhanced clarification prompt, comprises one or moreimages.
 11. The method of claim 1, further comprising: receiving furtheruser input responsive to the rendering of the prompt; processing thefurther user input to determine to initialize the first particularaction instead of the second particular action; and causinginitialization of the first particular action.
 12. The method of claim11, wherein the output of the enhanced clarification prompt comprises: afirst portion comprising one or both of a first image and a firstaudible output corresponding to the first action, and a second portioncomprising one or both of a second image and a second audible outputcorresponding to the second action, wherein the first portion isrendered temporally before the second portion; wherein the further userinput is a spoken utterance that references a temporal position; andwherein processing the further user input to determine to perform thefirst particular action instead of the second particular actioncomprises determining to perform the first action based on determiningthat the temporal position, referenced by the spoken utterance,corresponds to the rendering of the first portion.
 13. The method ofclaim 11, wherein the output of the enhanced clarification promptcomprises: a first image corresponding to the first action, and a secondimage corresponding to the second action, wherein the first image andthe second image are visually rendered at the same time; wherein thefurther user input is a touch input being directed at the first image;and wherein processing the further user input to determine to performthe first particular action instead of the second particular actioncomprises determining to perform the first particular action based onthe touch input being directed to the first image that corresponds tothe first action.
 14. A system comprising: one or more computers and oneor more storage devices storing instructions that are operable, whenexecuted by the one or more computers, to cause the one or morecomputers to perform operations comprising: processing audio data thatis detected via one or more microphones of an automated assistant deviceand that captures a user utterance; identifying, based on the processingof the audio data, one or more words corresponding to the userutterance; determining, based on processing the words corresponding tothe user utterance, that the words correspond with initiation of a firstparticular action exclusively and with initiation of a second particularaction exclusively; in response to determining that the words correspondwith initiation of the first particular action exclusively and with thesecond particular action exclusively: determining whether, in solicitingfurther user interface input for disambiguating between the firstparticular action and the second particular action, to provide a naturallanguage (NL) only clarification prompt that is restricted to renderingNL, or to instead provide an enhanced clarification prompt that rendersNL and renders output that is in addition to NL; and causing thedetermined one of the NL only clarification prompt or the enhancedclarification prompt to be rendered at the assistant device.
 15. Thesystem of claim 14, wherein determining whether to provide the NL onlyclarification prompt, or to instead provide the enhanced clarificationprompt, is performed prior to processing the audio data.
 16. The systemof claim 14, wherein determining whether to provide the NL onlyclarification prompt, or to instead provide the enhanced clarificationprompt further comprises: identifying, based on analysis of historicalautomated assistant interaction data, a failure metric for the NL onlyclarification prompt; and determining whether the failure metricsatisfies a threshold.
 17. The system of claim 16, wherein determiningthe failure metric comprises: determining, from the historical automatedassistant interaction data, a quantity of occurrences of non-clarifyinguser input and/or of no user input responsive to prior automatedassistant renderings that correspond to the NL only clarificationprompt.
 18. The system of claim 17, wherein the NL only clarificationprompt is generated based on a clarification template, and wherein theprior automated assistant renderings that correspond to the NL onlyclarification prompt comprise renderings of the NL only clarificationprompt and renderings of additional prompts that are also generatedbased on the clarification template.
 19. The system of claim 17, whereinthe prior automated assistant renderings that correspond to the NL onlyclarification prompt consist of renderings of the NL only clarificationprompt.
 20. A non-transitory computer-readable medium storing softwarecomprising instructions executable by one or more computers which, uponsuch execution, cause the one or more computers to perform operationscomprising: processing audio data that is detected via one or moremicrophones of an automated assistant device and that captures a userutterance; identifying, based on the processing of the audio data, oneor more words corresponding to the user utterance; determining, based onprocessing the words corresponding to the user utterance, that the wordscorrespond with initiation of a first particular action exclusively andwith initiation of a second particular action exclusively; in responseto determining that the words correspond with initiation of the firstparticular action exclusively and with the second particular actionexclusively: determining whether, in soliciting further user interfaceinput for disambiguating between the first particular action and thesecond particular action, to provide a natural language (NL) onlyclarification prompt that is restricted to rendering NL, or to insteadprovide an enhanced clarification prompt that renders NL and rendersoutput that is in addition to NL; and causing the determined one of theNL only clarification prompt or the enhanced clarification prompt to berendered at the assistant device.